On the command line, I used
format override fs=fat32 while in
diskpart, assuming I had selected my 8GB flash drive, and realised I'd accidentally selected my 2TB external drive which had been assigned the same number after reboot (it's been a long night).
The format ran for about a minute or so, without progressing to 1%, before I realised what I'd done and did CtrlC.
The external drive no longer shows up in My Computer, even after a reboot of my computer, although it is visible in Device Manager.
As you can imagine, I'm panicking a fair bit right now, fearing I've lost a terabyte and a half of data - no backups of this particular drive, obviously.
Any help - and assurance that I haven't lost anything or wrecked my drive - would be vastly appreciated. Thanks.
Update 1: In
list volume, selecting the raw volume with
select volume #, and then doing
assign assigns it a drive letter, making it discoverable to Explorer and in My Computer, although it then gives the error that it needs to be formatted. From thereon, clicking on the drive in My Computer returns the error:
H:\ is not accessible
The parameter is incorrect.
Update 2: Running the trial ("Simple") version of GetDataBack on the drive took around 26 hours, and returned at least a hundred different sectors of varying sizes, including large FAT32 and NTFS sectors.
Doing some detailed digging into the results of GetDataBack's thorough search showed me the full list of filesystems. Shockingly, buried in that list I found a 1.82 TB sector, which roughly corresponds to the size of my lost data. It's likely that this is it, and that all I now need to do is to recover to it to get 99% of my files back, but I'm hesitant to do anything before I understand what the other file systems are and why they're so large. The Ext filesystem registers as over 500GB, for example, and several other NTFS filesystems are over 400GB. Does anyone have any idea what these other file systems may be?